微量油基纳米流体静电雾化切削润滑性能及机理研究

发布时间：2018-06-04 23:49

本文选题：油基纳米流体 + 摩擦学性能　；参考：《江苏科技大学》2016年硕士论文

【摘要】：微量润滑因极大限度地减少了切削液的使用及良好的切削加工性能而成为一种普遍关注的冷却润滑技术。然而其冷却润滑性能尚不能满足高效加工的高要求,并且在切削环境中易引起较高的油雾浓度。为提高冷却润滑性能和改善切削环境,本文提出开展微量油基纳米流体静电雾化切削润滑性能及机理研究。主要研究工作如下:(1)切削用纳米流体的分散性与热物性采用两步法制备了以石墨、多壁碳纳米管和金刚石为纳米颗粒,以切削用LB2000植物性润滑油为基液的油基纳米流体。研究了体积分数、振动时间、纳米颗粒尺寸和种类对纳米流体粒径分布、粘度、表面张力及导热系数的影响,发现了上述因素对纳米流体分散性和热物性的影响规律,为其在切削加工中的选用提供理论依据。(2)油基纳米流体摩擦学性能在瑞士CSM公司制造的销-盘摩擦磨损试验机上,进行油基纳米流体摩擦性能试验,发现添加纳米石墨与碳纳米管可以显著提高基础油的减摩性和抗磨性,结合构建的摩擦学模型与钛合金盘表面磨痕形貌及能谱分析,揭示了纳米石墨与碳纳米管作为LB2000植物性润滑油添加剂的润滑机理。(3)静电雾化切削的静电场有限元仿真在静电雾化切削构想基础上,利用Ansoft Maxwell软件建立了静电雾化切削的静电场有限元模型,分析了喷嘴角度、电极电压、电极间距和喷嘴结构对静电场强度的影响,获得了静电场强度随上述因素的变化规律及优化的喷嘴角度与喷嘴结构,为进行静电雾化切削试验提供理论依据。(4)微量纳米流体静电雾化切削试验构建了静电雾化切削系统,开展了不同冷却润滑条件下的钛合金铣削试验与切削环境油雾浓度检测,分析了冷却润滑条件对刀具磨损和油雾浓度的影响。试验结果表明,相对于微量润滑切削而言,微量油基纳米流体静电雾化切削不仅有效地降低了刀具磨损,而且明显改善了切削环境空气质量。
[Abstract]:Micro lubrication has become a widely concerned cooling lubrication technology due to its reduced use of cutting fluid and good machining performance. However, its cooling and lubricating performance can not meet the high requirement of high efficiency machining, and it is easy to cause high concentration of oil mist in cutting environment. In order to improve the cooling lubricity and the cutting environment, the lubrication performance and mechanism of micro oil based nano fluid electrostatic atomization cutting were studied in this paper. The main research work is as follows: (1) the dispersity and thermal properties of nano-fluids used in cutting were prepared by two-step method. The oil-based nano-fluids were prepared using graphite, multi-walled carbon nanotubes and diamond as nanoparticles and LB2000 vegetable lubricating oil as the base solution for cutting. The effects of volume fraction, vibration time, size and type of nanoparticles on the particle size distribution, viscosity, surface tension and thermal conductivity of nano-fluids were studied. The tribological properties of oil based nano fluids were tested on a pin disk friction and wear tester made by CSM Company of Switzerland. It was found that the addition of nano-graphite and carbon nanotubes could significantly improve the antifriction and antiwear properties of base oil. The tribological model was combined with the wear trace morphology and energy spectrum analysis on the surface of titanium alloy disc. The lubrication mechanism of nano-graphite and carbon nanotube as LB2000 vegetable lubricating oil additive is revealed. The electrostatic field finite element simulation of electrostatic atomization cutting is based on the idea of electrostatic atomization cutting. The finite element model of electrostatic field in electrostatic atomization cutting is established by using Ansoft Maxwell software. The influence of nozzle angle, electrode voltage, electrode spacing and nozzle structure on electrostatic field intensity is analyzed. The variation law of electrostatic field intensity with the above factors and the optimized nozzle angle and nozzle structure are obtained. The electrostatic atomization cutting system is constructed for electrostatic atomization cutting test. The milling test of titanium alloy under different cooling lubrication conditions and the detection of oil fog concentration in cutting environment were carried out. The effects of cooling lubrication conditions on tool wear and oil fog concentration were analyzed. The experimental results show that compared with micro-lubricating cutting, micro-oil based nano-fluid electrostatic atomization cutting not only effectively reduces tool wear, but also obviously improves the air quality of cutting environment.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG501.5

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